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FSD210B Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. FSD210B
Description  Green Mode Fairchild Power Switch (FPS)
Download  18 Pages
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSD210B Datasheet(HTML) 3 Page - Fairchild Semiconductor

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FSD210B, FSD200B
Pin Definitions
Pin Configuration
Figure 5. Pin Configuration (Top View)
Pin Number
Pin Name
Pin Function Description
1, 2, 3
Sense FET source terminal on primary side and internal control ground.
The feedback voltage pin is the inverting input to the PWM comparator and
it has a normal input level between 0.5V and 2.5V. It has a 0.25mA current
source connected internally while a capacitor and optocoupler are typically
connected externally. A feedback voltage of 4.5V triggers over load protec-
tion (OLP). There is a time delay while charging external capacitor Cfb from
3V to 4.5V using an internal 5uA current source. This time delay prevents
false triggering under transient conditions, but still allows the protection
mechanism to operate under true overload conditions.
Positive supply voltage input. Although connected to an auxiliary transform-
er winding, current is supplied from pin 8 (Vstr) via an internal switch during
startup (see Internal Block Diagram section). It is not until Vcc reaches the
UVLO upper threshold (8.7V) that the internal start-up switch opens and de-
vice power is supplied via the auxiliary transformer winding.
This pin is connected to a storage capacitor. A high voltage regulator laid be-
tween pin 8 (Vstr) and this pin, provides supply voltage to the device during
startup and normal operation. The FSD200B eliminates the need for an aux-
iliary bias winding and associated external components.
The drain pins are designed to connect directly to the primary lead of the
transformer and are capable of switching a maximum of 700V for 7DIP and
670V for 7LSOP. Minimizing the length of the trace connecting these pins to
the transformer will decrease leakage inductance.
This pin connects directly to the rectified AC line voltage source for both the
FSD200B and FSD210B.
For the FSD210B, at start up the internal switch supplies internal bias and
charges an external storage capacitor placed between the Vcc pin and
ground. Once the Vcc reaches 8.7V, the internal switch is opened.
For the FSD200B, an internal high voltage regulator provides constant sup-
ply voltage.

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